Optics: image projectors – Light shield – mask – hood – or diaphragm
Reexamination Certificate
2005-09-30
2008-10-07
Sever, Andrew T (Department: 2851)
Optics: image projectors
Light shield, mask, hood, or diaphragm
C353S099000, C359S290000
Reexamination Certificate
active
07431464
ABSTRACT:
A projection display system in which light use efficiency and image brightness are enhanced by collecting and using substantially all of the light that has been diffracted from a diffractive linear display device without loss of higher-order modes of diffracted light. The projection display system includes a light source, a linear light illumination system that transforms light emitted from the light source into a thin linear light, a diffractive linear display device that modulates the luminous intensity of the thin linear light by selectively diffracting the thin linear light, a mode selection optical system that selectively transmits or filters out the light diffracted by the diffractive linear display device according to the order of the diffracted light, a scanner that scans a linear image projected from the mode selection optical system, and a projection lens that enlarges and projects the image onto a screen.
REFERENCES:
patent: 6411425 (2002-06-01), Kowarz et al.
patent: 6987616 (2006-01-01), Tamada et al.
patent: 2004/0150869 (2004-08-01), Kasai
patent: 2006/0082857 (2006-04-01), Song et al.
patent: WO 03/085441 (2003-10-01), None
LG Electronics Inc.
Sever Andrew T
Workman Nydegger
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